Add 1 cup water & cinnamon stick to saucepan. Bring to boil.
Remove from heat and stir in brown sugar. Let sit while preparing other ingredients. (You can also make ahead and store in fridge so it's chilled)
Muddle the lime & mint in a cocktail shaker.
Add your homemade syrup, apple cider, & rum to the cocktail shaker. Fill up with ice.
Shake Shake Shake & pour into whatever ice-filled glass you wish!
Top with club soda and mint!